From e41f7d4ee5bdb00da7d327a00b0ab9c4a2e9eaa3 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Tue, 22 Feb 2011 14:02:58 -0500 Subject: merge path_init and path_init_rcu Actual dependency on whether we want RCU or not is in 3 small areas (as it ought to be) and everything around those is the same in both versions. Since each function has only one caller and those callers are on two sides of if (flags & LOOKUP_RCU), it's easier and cleaner to merge them and pull the checks inside. Signed-off-by: Al Viro --- fs/namei.c | 118 ++++++++++++++++++------------------------------------------- 1 file changed, 35 insertions(+), 83 deletions(-) (limited to 'fs/namei.c') diff --git a/fs/namei.c b/fs/namei.c index f5de5bb1a61f..b9e537980ef5 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -1520,45 +1520,44 @@ return_err: return err; } -static int path_init_rcu(int dfd, const char *name, unsigned int flags, struct nameidata *nd) +static int path_init(int dfd, const char *name, unsigned int flags, struct nameidata *nd) { int retval = 0; int fput_needed; struct file *file; nd->last_type = LAST_ROOT; /* if there are only slashes... */ - nd->flags = flags | LOOKUP_RCU; + nd->flags = flags; nd->depth = 0; nd->root.mnt = NULL; nd->file = NULL; if (*name=='/') { - struct fs_struct *fs = current->fs; - unsigned seq; - - br_read_lock(vfsmount_lock); - rcu_read_lock(); - - do { - seq = read_seqcount_begin(&fs->seq); - nd->root = fs->root; - nd->path = nd->root; - nd->seq = __read_seqcount_begin(&nd->path.dentry->d_seq); - } while (read_seqcount_retry(&fs->seq, seq)); - + if (flags & LOOKUP_RCU) { + br_read_lock(vfsmount_lock); + rcu_read_lock(); + set_root_rcu(nd); + } else { + set_root(nd); + path_get(&nd->root); + } + nd->path = nd->root; } else if (dfd == AT_FDCWD) { - struct fs_struct *fs = current->fs; - unsigned seq; - - br_read_lock(vfsmount_lock); - rcu_read_lock(); + if (flags & LOOKUP_RCU) { + struct fs_struct *fs = current->fs; + unsigned seq; - do { - seq = read_seqcount_begin(&fs->seq); - nd->path = fs->pwd; - nd->seq = __read_seqcount_begin(&nd->path.dentry->d_seq); - } while (read_seqcount_retry(&fs->seq, seq)); + br_read_lock(vfsmount_lock); + rcu_read_lock(); + do { + seq = read_seqcount_begin(&fs->seq); + nd->path = fs->pwd; + nd->seq = __read_seqcount_begin(&nd->path.dentry->d_seq); + } while (read_seqcount_retry(&fs->seq, seq)); + } else { + get_fs_pwd(current->fs, &nd->path); + } } else { struct dentry *dentry; @@ -1578,62 +1577,18 @@ static int path_init_rcu(int dfd, const char *name, unsigned int flags, struct n goto fput_fail; nd->path = file->f_path; - if (fput_needed) - nd->file = file; - - nd->seq = __read_seqcount_begin(&nd->path.dentry->d_seq); - br_read_lock(vfsmount_lock); - rcu_read_lock(); + if (flags & LOOKUP_RCU) { + if (fput_needed) + nd->file = file; + nd->seq = __read_seqcount_begin(&nd->path.dentry->d_seq); + br_read_lock(vfsmount_lock); + rcu_read_lock(); + } else { + path_get(&file->f_path); + fput_light(file, fput_needed); + } } - nd->inode = nd->path.dentry->d_inode; - return 0; -fput_fail: - fput_light(file, fput_needed); -out_fail: - return retval; -} - -static int path_init(int dfd, const char *name, unsigned int flags, struct nameidata *nd) -{ - int retval = 0; - int fput_needed; - struct file *file; - - nd->last_type = LAST_ROOT; /* if there are only slashes... */ - nd->flags = flags; - nd->depth = 0; - nd->root.mnt = NULL; - - if (*name=='/') { - set_root(nd); - nd->path = nd->root; - path_get(&nd->root); - } else if (dfd == AT_FDCWD) { - get_fs_pwd(current->fs, &nd->path); - } else { - struct dentry *dentry; - - file = fget_light(dfd, &fput_needed); - retval = -EBADF; - if (!file) - goto out_fail; - - dentry = file->f_path.dentry; - - retval = -ENOTDIR; - if (!S_ISDIR(dentry->d_inode->i_mode)) - goto fput_fail; - - retval = file_permission(file, MAY_EXEC); - if (retval) - goto fput_fail; - - nd->path = file->f_path; - path_get(&file->f_path); - - fput_light(file, fput_needed); - } nd->inode = nd->path.dentry->d_inode; return 0; @@ -1663,10 +1618,7 @@ static int path_lookupat(int dfd, const char *name, * be handled by restarting a traditional ref-walk (which will always * be able to complete). */ - if (flags & LOOKUP_RCU) - retval = path_init_rcu(dfd, name, flags, nd); - else - retval = path_init(dfd, name, flags, nd); + retval = path_init(dfd, name, flags, nd); if (unlikely(retval)) return retval; -- cgit v1.2.3-55-g7522